Circuit Function
A CMOS NAND gate requires two series pull-down NMOS transistors connected to ground and two parallel pull-up PMOS transistors connected to the supply voltage. Only when there are two low inputs will the output go low (that is 00, 01, 10 gives a 1 and 11 gives a 0 output). Metal connects to the output and polysilicon as the input. If out-put metal layer from one gate connects to the next gate then the layer must be changed to polysilicon by inserting a contact between the metal and polysilicon layers. |
